A "hack attempt" sound file is now supported in the Terminal Server, Mail Server,  and Services.

"login" and "logoff" sound files are now supported in the Terminal Server, FTP Server, Web Server, Mail Server, and Services.
This enhancement fixes Issue #157

The following sound files may now be configured in the [Global] section of the ctrl/sbbs.ini file, if desired to set the default sound files for all servers/services in on place:
- AnswerSound
- LoginSound
- LogoutSound
- HangupSound
- HackAttemptSound

This won't impact Synchronet as it has a separate signal handling
thread, but we still need to behave properly for processes that
don't.  I'm also saying that ENOMEM does not indicate a disconnection,
though it may be better to pretend it was disconnected...

This reverts commit 9fd06985.

ERROR 2 (No such file or directory) in logout.cpp line 189 (backout) opening "/sbbs/node1/backout.dab"

(when/what is executed, or at least attempted).

is set: this insures that uninitialized msg-scan ptrs/cfg won't be
written to disk unless a successful logon()/getmsgptrs() was called first.
This probably fixes the sighting that echicken reported where a failed
SSH login caused his sub-scan config file (data/user/0001.subs) to contain
uninitialized/garbage values.
logout() could be called from multiple places (e.g. JS and Baja modules),
even before a successful login is completed, so this sighting is not
entirely impractical.

("Node X", user alias, etc.) - so removing a lot of the redundancies.
Also, logging the current timed event code and other prefixes in the
event thread log messages - something I've wanted for a while now.
There might be some redundant "Node X" strings, so if you see some funny
looking log message, please let me know.

after a user (has been) disconnected and before the node transitions to waiting
for connection (WFC) status. Usually the duration of this status is very short,
but it can be longer (e.g. for running log-out module and event) and for (new)
msg-scan pointer fix-ups.
Updated logout() to remove some cruft and add some more log/debug output.
Automatic new-scan pointer fix-ups when performing new-message scans (if the
current pointer is greater than the last message number, set it to the last
message number) and when saving message pointers.
Passing user_t* to get/putmsgptrs() instead of message number now (to better
detect Guest account).

all exported functions and data types using a 32-bit time_t (time32_t).
(part 2 of 2)

inserting (long) typedefs to prevent warnings, but in the case of the JS File()
class, actually supporting file lengths > 32-bit.

passed 0 for the length.

module (.js or .bin) files.

variants (gmtime_r, localtime_r, and ctime_r) for thread-safe operation on Unix

outside the sbbs_t class).

GMT/UTC.

Each function that requires a temp string variable, now has its own "tmp" local variable.

Pkzip/unzip required *.* to add/extract all files in a directory. <sigh>

Created system call wrappers.c (and sbbswrap.h) and moved target platform-specific macros and code there.